Originally Posted by
g.yau
I have a slightly different but similar situation.
I booked a flight "LHR-HND" on Virgin Atlantic instead of United, a flight which is codeshare with NH. I've been able to get my 6 digit NH number on the NH website. However, I cannot fill in the passport details or choose seat selection; due to an error. I was wondering would I need to call NH in order to solve this problem?
I gather that my situation is like the no.4 experience as mentioned by evergrn
"4. Seat map/assignment is not accessible online on ANA site, if it's paid booking (non-award) via UA. However, call NH and they should always be able to assign seats over the phone."
Yes, you should definitely try calling NH for seat assignment.